Water connection



June 14, 1938.

G. W. HULSHIZER WATER CONNECTION Filed June 26, 1937 INVENTOR {yell71275122 ea av I H l5 ATTORNEY.-

Patented June 14, 1938 UNITED STATES PATENT OFFEE WATER CONNECTIONApplication June 26, 1937, Serial No. 150,482

6 Claims.

This invention relates to rock drills, and more particularly to a waterconnection for attaching the cleansing water supply hose to the rockdrill casing.

One object of the invention is to maintain a fluid tight seal betweenthe casing and a water connection swivelled in the casing.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is an elevation, partly broken away, of a rock drill equippedwith a water connection constructed in accordance with the practice ofthe invention, and

Figure 2 is a transverse View taken through Figure l on the line 2-2.

Referring more particularly to the drawing, 23 designates a rock drillcomprising a cylinder 2| and front and back heads 22 and 23,respectively, which constitute the casing parts of the rock drill andmay be clamped together by side bolts I 9.

The front head 22 houses a chuck mechanism 24 to accommodate a workingimplement 25 and an anvil block 26 for transmitting the blows of ahammer piston 21 to the working implement. The working implement is ofthe hollow type, having a passage 28 for conveying cleansing liquid tothe cutting bit (not shown). The rear end of the passage 28 accommodatesthe end of a water tube 29 which extends through the cylinder 2B andinto a recess 30 in the back head.

On the rearmost extremity of the water tube 29 is a flange (H whichseats upon the bottom of the recess 30 and is held in sealingrelationship therewith by a plug 32 threaded into the recess. The flange3i and the adjacent portion of the plug 32 are of smaller diameter thanthe recess 30 and cooperate with the Wall of the recess to define anannular chamber 33 which communicates with the interior of the tube 29through a passage or passages 34 in the plug 32.

The cleansing water supplied to the water tube 29 may be conveyed to therock drill from a source of supp-1y by a. conduit of which only theterminal connection 35 connecting the conduit to the casing of the rockdrill is shown. The connection 35 extends into a recess 36 in the backhead, and a passage 3?, also in the back head, affords communicationbetween the inner end of the recess 36 and the annular chamber 33.

In accordance with the practice of the invention the connection 35 has areduced end portion 38 extending into the passage 37, and in the bottomof the recess 3%; encircling the reduced portion 38 is a packing member39 to prevent leakage of water from the passage 31 into the recess. Thepacking member 39 isheld in position, and may be compressed, by abushing 40 threaded into the recess to secure the connection 35 to theback head. The bushing 40 has a coniforrn bore of which the surface 4|serves as a seat for a similar surface 42 on the periphery of theconnection 35 and cooperates therewith to form a fluid-tight joint.

The connection 35 is swivelled in the back head so that the conduitconnected thereto may be readily oscillated from one position toanother. In order to make this movement possible it is essential thatthe connection be capable of a slight degree of endwise movement tobreak the frictional engagement between the surfaces 4! and 42 and thata yielding pressure, as for example that of the water and which, in thepresent instance, acts against a pressure surface 43 on the end of thereduced portion 38 of the connection, be employed to press theconnection against the surface 4!. The pressure of the water, however,is often of too low a value to prevent accidental unseating of theconnection, as when it is brought into contact with the work. Theconnection is accordingly provided with an additional pressure surfacel4, preferably located at the end of larger diameter of the coniformportion and confronting the packing member 39, although spaced withrespect thereto to provide a space or chamber into which pressure fluidis supplied by a passage 45 leading from a source of pressure fluid, asfor example, the chamber 46 containing the throttle valve ll whichcontrols the admission of pressure fluid into the rock drill foractuating its percussive element.

The passage 455 communicates with the recess 36 through ports 48 in thebushing 46 and the pressure fluid thus admitted into the recess actsagainst the pressure surface 44 for pressing the sealing engagement ismaintained between the connection and its seat and at the same time theconnection may be readily oscillated, as required, to dispose theattached conduit in a desired position.

I claim:

1. In a pressure fluid actuated rock drill, the combination of a casingand a conduit for liquid, a connection for conveying liquid to theconduit, sealing surfaces on the casing and the connection, a pressuresurface on the connection sub jected to pressure fluid for maintainingthe sealing surfaces in sealing relationship with each other, and meansfor preventing the flow of liquid to the pressure surface.

2. In a pressure fluid actuated rock drill, the combination of a casingand a conduit for liquid, a connection for conveying liquid to theconduit, sealing surfaces on the casing and the connection, and apluralit of pressure surfaces on the connection, one of said pressuresurfaces being subjected to the pressure of the liquid and the othenpressure surface being subjected to pressure fluid for maintaining thesealing surfaces in sealing relationship with each other.

3. In a pressure fluid actuated rock drill, the combination of a casingand a conduit for liquid, a connection for conveying liquid to theconduit and being swivelled in the casing, frusto-conical surfaces onthe connection and in the casing, a

' pressure surface on the connection subjected to pressure fluid tomaintain the frusto-conical surfaces in sealing relationship with eachother, and means for preventing the flow of liquid to the pressuresurface. I

4. A water connection comprising a casing having a passage for liquidand a channel for pressure fluid, a connection for conveying liquid tothe passage and being swivelled in the casing, surfaces on the casingand the connection cooperating with each other to effect a-seal, and apressure surface on the connection subjected to pressiu'e fluid tomaintain the surfaces in sealing relationship with each other.

5. In a pressure fluid actuated rock drill, the combination of a casingand a conduit for liquid, a recess in the casing, a passage leading fromthe recess to the conduit, a connection swivelled in the recess andextending into the passage, a packing member encircling the connectionto effect a seal between the recess and the passage, surfaces on thecasing and the connection cooperating with each other to effect a seal,a pressure surface on the connection, and a passage for con veyingpressure fluid into the recess against the pressure surface to maintainthe said surfaces in sealing relationship with each other.

6. A Water connection for rock drills, comprising a casing, a connectionswivelled in the casing, a packing member in the casing encircling theconnection, and means to retain the connection in the casing and tocompress the packing member.

GEORGE W. HULSHIZER.

